Synthesis and characterization of new organotin(IV) complexes with polyfunctional ligands

New mono-, di- and tri-organotin(IV) derivatives containing the neutral bis(2-pyridylthio)methane ligand, [(pyS)2CH2] and tris(2-pyridylthio)methane ligand, [(pyS)3CH] have been synthesized from reaction with SnRnCl4−n (R = Me, nBu, Ph and Cy, n = 1–3) acceptors. Mono-nuclear adducts of the type {[(pyS)2CH2]RnSnCl4−n} and {[(pyS)3CH]RnSnCl4−n} have been obtained and characterized by elemental analyses, FT-IR, ESI-MS, multinuclear (1H and 119Sn) NMR spectral data. The 1H and 119Sn NMR and ESI-MS data suggest for the triorganotin(IV) derivatives a complete dissociation of the compounds in solution. The mono- and di-organotin(IV) derivatives show a greater stability in solution, and their spectroscopic data are in accordance with the existence of six-coordinated RSnCl3N2 or R2SnCl2N2 species.